... you're not required to be locked into MS Office unless you're a student or a business (or their employee), anyway, in which case if you don't have full functioning .docx/etc. integration (i.e., you have office, because insofar as I've noticed no-one has managed to entirely crack whatever MS does to kill compatibility these days), you're very likely to be just flat screwed. You, yourself, may be able to get away with not having access to the MS Office suite, but you're going to be working with a lot of people that do use it, and have to be able to make sure there's no compatibility issues, or your grade or (much, much worse) your business tanks. M'by and large a pretty high-functioning computer user, m'self, and getting through this latest round of college education was a goddamn mess without home access to Office -- most of the folks I went through school with were entirely willing to bite the cost of MS instead of dealing with that mess, even with the school providing free library access.
Which is how it works. It doesn't matter how spoiled for choice you are if the vast majority of people are still using a single thing you have to be able to work with. That's pretty much literally how MS is maintaining their hold on things -- businesses and their workers can't stop using MS software because too many other people are still using it, and trying to wean off means they introduce a whole host of compatibility and communication issues to their workflow and interbusiness communication. And in doing so, lose business, potentially to a crippling degree. Integrating people working with different software is a bloody nightmare in the business world.
Maybe (shit, hopefully -- I'd love to actually be able to go into a job involving any degree of digital paperwork and expect to not need easy access to office) the mobile/cloud upswing is going to chip into that to a meaningful degree. M'personally not holding my breath at the moment, and won't until whatever MS's latest format is stops being the default for business (and by dint of that, education and a great deal of casual personal use). Because right now, it is, and it's not really budging, even as mobile use increases and starts to integrate. We've still got a long bloody way to go before that actually makes inroads hard enough to be called substantial.